Quiet: Provides a powerful low-noise breeze (between 20-30dB). The USB fan keeps you cool while keeping the sound to a minimum, so you can work, read or relax without disturbance. Portable: 16.5cm x 8cm x 1.8cm / 6.50" x 3.15" x 0.71" (Approx. ). Small and compact, the desk fan quietly fits easily into your bag, and can be held with you all the time, making it perfect for travel. USB powered: USB desktop fan is USB powered and can be charged directly from your computer, mobile power and other devices. Battery capacity: 4000mA. Speed: Low/Medium/High Speed. The mini desk fan has a wide range of air speeds, allowing you to enjoy the cold and longevity. [Notice] - Actual color may be slightly different from the image due to different monitor and light effect; Please allow 1-3cm deviation due to manual measurement.